duck!

[Walter Bright]

Andrei Alexandrescu wrote:
> Please substitute: "X does duck typing in the D programming language". 
> What is X?
> 
> FWIW this was the story with "immutable". Walter got tired of 
> explaining: "Invariant implements immutable types in the D programming 
> language".

Boy did I ever get tired of that. It's a classic example of names mattering - 
it's not just a bikeshed color.